CN110976512A - Cold rolling method for TC4 titanium alloy wire - Google Patents

Cold rolling method for TC4 titanium alloy wire Download PDF

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Publication number
CN110976512A
CN110976512A CN201911371849.9A CN201911371849A CN110976512A CN 110976512 A CN110976512 A CN 110976512A CN 201911371849 A CN201911371849 A CN 201911371849A CN 110976512 A CN110976512 A CN 110976512A
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China
Prior art keywords
cold rolling
titanium alloy
alloy wire
annealing
wire
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CN201911371849.9A
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Chinese (zh)
Inventor
辛昱江
董军利
崔俊
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Baoji Xinnuo New Metal Materials Co ltd
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Baoji Xinnuo New Metal Materials Co ltd
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Priority to CN201911371849.9A priority Critical patent/CN110976512A/en
Publication of CN110976512A publication Critical patent/CN110976512A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods

Abstract

The invention provides a cold rolling method for TC4 titanium alloy wires. According to the invention, the continuous cold rolling of the TC4 titanium alloy wire is realized by reasonably distributing the cold rolling deformation of each pass and adopting a mode of small deformation and accumulated large deformation, the rolling precision is high, the speed is high, and the method is suitable for the continuous processing of large single-weight (more than or equal to 30 kg/disc) coil wires; the cold rolling process is matched with proper heat treatment, so that the metallographic structure and the mechanical property of the material can be well matched on the basis of ensuring the processing performance of the wire; the processing process is stable, the produced wire has good consistency of mechanical property and dimensional precision, the production effect and the product quality stability are greatly improved compared with the traditional cold drawing process, and the precision, the performance and the stability of the product completely meet the requirements of customers; the wire is rolled without multiple heat treatment and graphite emulsion lubricant coating, so that the wire is prevented from sucking harmful gas; the method provided by the invention has the advantages of low cost and simple process, and can realize industrial large-scale production.

Description

Cold rolling method for TC4 titanium alloy wire
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a cold rolling method for a TC4 titanium alloy wire.
Background
The titanium alloy has the characteristics of good corrosion resistance, specific strength, non-magnetism, high and low temperature performance and the like, becomes a remarkable high-performance new material, and has great activity in the military and civil fields after the twenty-century and the fifty years.
In the processing process of the TC4 titanium alloy wire, a common processing technology is cold drawing (room temperature drawing), the titanium alloy has high strength and low plasticity at normal temperature, most of the processing processes are made into semi-finished products after heating, the bar wire of the iron alloy is generally processed by a method of rolling first and then drawing, the larger the section of the alloy is, the higher the content of alloy elements is, the lower the equipment power is, and the higher the temperature to be heated is. Deforming at high temperatures, while forming macro-and microstructures of large grains with low mechanical properties. In order to obtain uniform and consistent fine grain structure, deformation is carried out under the condition of 40-50 ℃ lower than phase transition temperature so as to destroy the cast coarse grain structure. The polycrystalline transformation forms an inequilibrium structure under certain conditions, reducing the stability of the product performance. High temperature during thermal deformation, severe metal oxidation, and poor surface quality, dimensional accuracy and mechanical strength of the product compared with cold deformation. The production method has the disadvantages of complicated processing procedures, long production period and high production cost.
In the cold drawing process of the TC4 titanium alloy wire, a lubricant is added in the surface treatment and drawing process of the wire in the early stage, the blank is treated by methods such as etching, salt bath and the like in the early production, and salt attached during the heat treatment is used as a lubricating material for hot drawing. According to the difference of annealing time and temperature, a layer of oxide scale is formed on the surface of the titanium alloy after annealing, a uniform and compact oxide film is formed in a proper time and temperature range, and the processing method of performing hot drawing by using the oxide film generated in the heat treatment and an auxiliary drawing lubricant is applied to the industrial production process. However, the hot drawing with multiple times is carried out before cold drawing at present, and harmful gases such as N, O and H are easily absorbed into rods and wires in the heat treatment process, and can not reach the national standard in serious cases. In order to obtain a good wire drawing lubricating effect, after the preparation of the TC4 titanium alloy wire lubricating coating is finished, a graphite emulsion lubricant is added for increasing the lubrication, but the graphite emulsion lubricating coating needs to be uniformly coated, the coating is too thick and is easy to be scratched, and the lubricating layer falls off and loses the effect during wire drawing.
The TC4 titanium alloy wire has large metal flow of the cold-drawn surface skin, which causes poor tissue uniformity of the wire after cold drawing; the surface layer of the cold-drawn wire is acted by the expansive force of the inner layer to generate circumferential tensile stress. Under tensile stress, the metal material is easy to form stress corrosion cracking under corrosive atmosphere. The deformation of cold drawing is small (about 8-20%), the number of cold drawing passes is large, the production cost is high, and the efficiency is low.
After the TC4 titanium alloy wire is subjected to cold drawing, the strength is increased, the elongation is reduced, and an obvious work hardening effect is generated, and after the TC4 titanium alloy wire is subjected to cold drawing for multiple times, the elongation after fracture, the reduction of area (plasticity index) and the yield strength of the material are seriously reduced, even do not reach the standard.
Aiming at the problems of cold drawing of the TC4 titanium alloy wire, the invention starts with blank preparation, hole pattern design, rolling speed, heat treatment process and other aspects, develops research and test, forms an effective TC4 titanium alloy wire cold rolling method, greatly improves the quality and production efficiency of the TC4 titanium alloy wire, and has important significance in the titanium alloy wire processing industry.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a cold rolling method for a TC4 titanium alloy wire, so that the TC4 titanium alloy wire has the advantages of large unit weight, uniform structure, excellent mechanical property, excellent surface quality, high production efficiency and capability of avoiding various defects in the cold drawing production process.
The first aspect of the invention provides a cold rolling method for a TC4 titanium alloy wire, which comprises the following steps of:
(1) annealing in an atmospheric furnace;
(2) carrying out first cold rolling;
(3) cold rolling for the second pass; annealing in an atmospheric furnace; inspecting defects;
(4) performing cold rolling for the third time;
(5) cold rolling in the fourth pass; annealing in an atmospheric furnace; inspecting defects;
(6) cold rolling in the fifth pass; annealing in an atmospheric furnace;
(7) straightening, cutting and polishing to obtain a finished product;
wherein the total deformation of the cold rolling is 90 percent at most, and the deformation of the cold rolling in a single pass is 10 to 25 percent.
Preferably, the first pass cold rolling deformation is 20-25% (e.g., 20%, 21%, 22%, 23%, 24%, 25%, etc.).
Preferably, the second pass cold rolling deformation is 15-20% (e.g., 15%, 16%, 17%, 18%, 19%, 20%, etc.).
Preferably, the third pass cold rolling deformation is 18-22% (e.g., 18%, 19%, 20%, 21%, 22%, etc.).
Preferably, the fourth pass cold rolling deformation is 13-19% (e.g., 13%, 14%, 15%, 16%, 17%, 18%, 19%, etc.).
Preferably, the fifth pass cold rolling deformation is 10-18% (e.g., 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, etc.);
preferably, before the operation of step (1), the blank is pretreated: acid washing and repairing, and grinding cracks and sticky pits on the surface of the blank completely.
Preferably, the annealing temperature in the step (1) is 750-800 ℃, and the heat preservation time is 50-70 min.
Preferably, the annealing temperature in the step (3) is 720-780 ℃, and the temperature is kept for 50-70 min.
Preferably, the annealing temperature in the step (5) is 700-760 ℃, and the temperature is kept for 30-60 min.
Preferably, the annealing temperature in the step (6) is 700-750 ℃, and the heat preservation time is 50-70 min.
Preferably, the cold rolling is performed using a 4-station tandem continuous cold rolling mill.
Preferably, the rolling pass is designed in a round-multi-edge-round structure.
In a second aspect of the invention, there is provided a TC4 titanium alloy wire produced by the TC4 titanium alloy wire cold rolling method of the first aspect of the invention.
Compared with the prior art, the invention has the beneficial effects that:
(1) the wire is rolled without multiple heat treatment and graphite emulsion lubricant coating, so that the wire is prevented from sucking harmful gas;
(2) the cold rolling deformation of each pass is reasonably distributed, the continuous cold rolling of the TC4 titanium alloy wire is realized by adopting a mode of small deformation and large deformation accumulation, the rolling precision is high, the speed is high, and the method is suitable for the continuous processing of large single-weight (more than or equal to 30 kg/coil) coil wires;
(3) the cold rolling process is matched with proper heat treatment, so that the metallographic structure and the mechanical property of the material can be well matched on the basis of ensuring the processing performance of the wire;
(4) the processing process is stable, the produced wire has good consistency of mechanical property and dimensional precision, the production effect and the product quality stability are greatly improved compared with the traditional cold drawing process, and the precision, the performance and the stability of the product completely meet the requirements of customers;
(5) the method provided by the invention has the advantages of low cost and simple process, and can realize industrial large-scale production.
Detailed Description
The invention will be better understood by reference to the following examples.
Example 1: cold rolling preparation of phi 3.0mm TC4 titanium alloy wire
Blank designation: TC4, state: coiling silk, specification: phi 9.8 mm. The cold rolling adopts a 4-station tandem continuous cold rolling mill, and the rolling pass adopts a round-multi-edge-round structural design.
Acid washing and repairing, and grinding cracks and sticky pits on the surface of the blank completely.
Annealing in an atmosphere furnace, and keeping the temperature at 780 ℃ for 60 min.
And (3) performing first cold rolling, wherein the deformation rate is 24.6%.
Cold rolling for the second pass with the deformation rate of 18.6 percent; annealing in an atmosphere furnace, and keeping the temperature at 750 ℃ for 60 min; and (6) inspecting the defects.
And the third cold rolling, wherein the deformation rate is 20.1%.
Cold rolling in the fourth pass with the deformation rate of 17.7 percent; annealing in an atmosphere furnace, and keeping the temperature at 730 ℃ for 45 min; and (6) inspecting the defects.
Cold rolling in the fifth pass with the deformation rate of 16.5 percent; annealing in an atmosphere furnace at 720 ℃ and keeping the temperature for 60 min.
Straightening, polishing for 3.3 → 3.0mm
The mechanical property conditions of the phi 3.0mmTC4 titanium alloy wire produced by the TC4 titanium alloy wire cold rolling method of the embodiment are shown in Table 1.
Table 1 mechanical properties of phi 3.0mm TC4 titanium alloy wire prepared by cold rolling:
comparative example 1: cold-drawing prepared phi 3.0mm TC4 titanium alloy wire
Blank designation: TC4, state: coiling silk, specification: phi 9.8 mm.
Grinding: ear and peeling on the surface of the stick, and grinding the folded roll skin.
Hot drawing: Φ 9.5 → Φ 9.4 → Φ 9.0+/-0.03mm*L
The method comprises the following steps: phi 9.0+/-0.03→Φ8.5+/-0.05L (outer diameter of the plate 800mm)
Acid washing and repairing (grinding cracks and sticky pits cleanly and thoroughly).
And (4) checking: the surface has no cracks and sticking pits.
And (3) atmospheric furnace heat treatment: preserving the heat for 30min at 730 ℃.
The first die is drawn at low temperature, the deformation rate is 20.2 percent, the annealing is carried out in an atmospheric furnace, and the temperature is kept at 720 ℃ for 60 min.
And performing low-temperature drawing on the second die, wherein the deformation rate is 18.9%, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
And drawing the third die at low temperature, wherein the deformation rate is 17.3 percent, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
Alkali washing and acid washing; vacuum annealing, and keeping the temperature at 720 ℃ for 70 min.
And drawing the fourth die at low temperature, wherein the deformation rate is 15.1%, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
Straightening, polishing for 3.3 → 3.0mm
The mechanical property conditions of the phi 3.0mmTC4 titanium alloy wire produced by adopting the TC4 titanium alloy wire cold-drawing method of the comparative example are shown in Table 2.
TABLE 2 mechanical properties of cold-drawn phi 3.0mm TC4 titanium alloy wire
As can be seen from a comparison of tables 1 and 2, the titanium alloy wire obtained in example 1 is lower in tensile strength than comparative example 1, higher in yield strength than comparative example 1, and much higher in elongation and shrinkage than comparative example 1, indicating that: compared with the traditional cold drawing method, the titanium alloy wire prepared by the cold rolling method has better mechanical property, good tensile strength and good plasticity matching.
Example 2: cold rolling preparation of phi 4.0mmTC4 titanium alloy wire
Blank designation: TC4, state: coiling silk, specification: phi 9.8 mm; the cold rolling adopts a 4-station tandem continuous cold rolling mill, and the rolling pass adopts a round-multi-edge-round structural design.
Acid washing and repairing, and grinding cracks and sticky pits on the surface of the blank completely.
Annealing in an atmosphere furnace, and keeping the temperature at 780 ℃ for 60 min.
And (3) performing first cold rolling, wherein the deformation rate is 25.0%.
Cold rolling for the second pass with the deformation rate of 17.9 percent; annealing in an atmosphere furnace, and keeping the temperature at 750 ℃ for 60 min; and (6) inspecting the defects.
And the third cold rolling, wherein the deformation rate is 21.1%.
And (5) cold rolling in the fourth pass with the deformation rate of 17.1%. Annealing in an atmosphere furnace, and keeping the temperature at 730 ℃ for 45 min; and (6) inspecting the defects.
Cold rolling in the fifth pass with the deformation rate of 17.5 percent; annealing in an atmosphere furnace, and keeping the temperature at 720 ℃ for 60 min.
Straightening and polishing to 4.3 → 4.0mm finished product
The mechanical property conditions of the phi 4.0mmTC4 titanium alloy wire produced by the TC4 titanium alloy wire cold rolling method of the embodiment are shown in Table 3.
TABLE 3 mechanical properties of cold rolled phi 4.0mmTC4 titanium alloy wire
Comparative example 2: cold drawing preparation of phi 4.0mm titanium alloy wire
Blank designation: TC4, state: coiling silk, specification: phi 9.8 mm.
Grinding: ear and peeling on the surface of the stick, and grinding the folded roll skin.
Hot drawing: Φ 9.5 → Φ 9.4 → Φ 9.0+/-0.03mm*L
The method comprises the following steps: phi 9.0+/-0.03→Φ8.5+/-0.05L (outer diameter of the plate 800mm)
Acid washing and repairing (grinding cracks and sticky pits cleanly and thoroughly).
And (4) checking: no crack and sticking pit on the surface
And (3) heat treatment: the temperature is kept at 730 ℃ for 30min (atmospheric furnace).
The first die is drawn at low temperature, the deformation rate is 21.1 percent, the annealing is carried out in an atmospheric furnace, and the temperature is kept for 60min at 720 ℃.
And performing low-temperature drawing on the second die, wherein the deformation rate is 18.2%, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
And drawing the third die at low temperature, wherein the deformation rate is 16.9 percent, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
Alkali washing and acid washing; vacuum annealing, and keeping the temperature at 720 ℃ for 70 min.
And drawing the fourth die at low temperature, wherein the deformation rate is 14.6 percent, annealing in an atmospheric furnace, and keeping the temperature at 720 ℃ for 60 min.
Straightening and polishing to 4.3 → 4.0mm finished product
The mechanical property conditions of the phi 4.0mmTC4 titanium alloy wires produced by adopting the TC4 titanium alloy wire cold-drawing method of the comparative example are shown in Table 4.
TABLE 4 mechanical properties of cold-drawn phi 4.0mm TC4 titanium alloy wire
As can be seen from a comparison of tables 3 and 4, the titanium alloy wire obtained in example 2 is lower in tensile strength than comparative example 2, higher in yield strength than comparative example 2, and much higher in elongation and shrinkage than comparative example 2, indicating that: compared with the traditional cold drawing method, the titanium alloy wire prepared by the cold rolling method has better mechanical property, good tensile strength and good plasticity matching.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims (10)

1. A cold rolling method for TC4 titanium alloy wire is characterized in that the following operations are carried out on a TC4 titanium alloy wire blank:
(1) annealing in an atmospheric furnace;
(2) carrying out first cold rolling;
(3) cold rolling for the second pass; annealing in an atmospheric furnace; inspecting defects;
(4) performing cold rolling for the third time;
(5) cold rolling in the fourth pass; annealing in an atmospheric furnace; inspecting defects;
(6) cold rolling in the fifth pass; annealing in an atmospheric furnace;
(7) straightening, cutting and polishing to obtain a finished product;
wherein the total deformation of the cold rolling is 90 percent at most, and the deformation of the cold rolling in a single pass is 10 to 25 percent.
2. The method of cold rolling TC4 titanium alloy wires according to claim 1, wherein the first cold rolling has a deformation ratio of 20-25%.
3. The method for cold rolling TC4 titanium alloy wires according to claim 1, wherein the second-pass cold rolling deformation rate is 15-20%.
4. The method of cold rolling TC4 titanium alloy wires according to claim 1, wherein the third cold rolling deformation rate is 18-22%.
5. The method for cold rolling TC4 titanium alloy wires according to claim 1, wherein the fourth pass cold rolling deformation rate is 13-19%.
6. The method for cold rolling TC4 titanium alloy wires according to claim 1, wherein the deformation rate of the fifth cold rolling is 10-18%.
7. The method for cold rolling TC4 titanium alloy wires according to claim 1, wherein the blank is pre-treated before the operation of step (1): acid washing and repairing, and grinding cracks and sticky pits on the surface of the blank completely.
8. The TC4 titanium alloy wire cold-rolling method as claimed in claim 1, wherein the annealing temperature in step (1) is 750-; the annealing temperature in the step (3) is 720-780 ℃, and the temperature is kept for 50-70 min; in the step (5), the annealing temperature is 700 and 760 ℃, and the temperature is kept for 30-60 min; in the step (6), the annealing temperature is 700-750 ℃, and the heat preservation time is 50-70 min.
9. The method for cold rolling the TC4 titanium alloy wire according to claim 1, wherein the cold rolling is performed by a 4-station tandem continuous cold rolling mill, and the rolling pass is designed in a round-multi-edge-round structure.
10. The TC4 titanium alloy wire produced by the TC4 titanium alloy wire cold rolling method of any one of claims 1 to 9.
CN201911371849.9A 2019-12-26 2019-12-26 Cold rolling method for TC4 titanium alloy wire Pending CN110976512A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113523013A (en) * 2021-08-19 2021-10-22 索罗曼(常州)合金新材料有限公司 Production process of thick-wire-diameter titanium alloy wire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01241302A (en) * 1988-03-23 1989-09-26 Hitachi Metals Ltd Manufacture of titanium wire for electrode
JP2001040462A (en) * 1999-07-28 2001-02-13 Sumitomo Metal Ind Ltd Production of titanium or titanium alloy fine diameter wire
CN103551810A (en) * 2013-10-28 2014-02-05 宝鸡市博信金属材料有限公司 Producing method for titanium alloy serrated flat wires
CN103736727A (en) * 2013-12-27 2014-04-23 西安建筑科技大学 TC16 titanium alloy bar temperature control continuous rolling method
CN103406386B (en) * 2013-07-29 2015-12-02 宝鸡众源金属加工有限公司 The preparation method of TC4 titanium alloy wire materials
CN108202088A (en) * 2017-11-22 2018-06-26 宁夏东方钽业股份有限公司 A kind of processing method of small dimension titanium or titanium alloy Bar Wire Product

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01241302A (en) * 1988-03-23 1989-09-26 Hitachi Metals Ltd Manufacture of titanium wire for electrode
JP2001040462A (en) * 1999-07-28 2001-02-13 Sumitomo Metal Ind Ltd Production of titanium or titanium alloy fine diameter wire
CN103406386B (en) * 2013-07-29 2015-12-02 宝鸡众源金属加工有限公司 The preparation method of TC4 titanium alloy wire materials
CN103551810A (en) * 2013-10-28 2014-02-05 宝鸡市博信金属材料有限公司 Producing method for titanium alloy serrated flat wires
CN103736727A (en) * 2013-12-27 2014-04-23 西安建筑科技大学 TC16 titanium alloy bar temperature control continuous rolling method
CN108202088A (en) * 2017-11-22 2018-06-26 宁夏东方钽业股份有限公司 A kind of processing method of small dimension titanium or titanium alloy Bar Wire Product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113523013A (en) * 2021-08-19 2021-10-22 索罗曼(常州)合金新材料有限公司 Production process of thick-wire-diameter titanium alloy wire
CN113523013B (en) * 2021-08-19 2022-04-08 索罗曼(常州)合金新材料有限公司 Production process of thick-wire-diameter titanium alloy wire

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